Button assembly with status indicator and programmable backlighting

ABSTRACT

A configurable switch matrix assembly with button assembly is disclosed for keypads used in devices such as primary control points for automation systems in homes vehicles, or commercial environments. The configurable switch matrix assembly preferably includes a frame for supporting a plurality of positionable cross members and optionally a baffle. The cross members and frame each preferably include cantilevers which can be deflected by pressing the button assemblies to activate switches associated with the keypad. Dynamic status lights and back lights may provide illumination of varying colors and intensities. Button labels may be easily replaced in the button assemblies. Button assemblies of different sizes and shapes may be easily attached to the configurable switch matrix assembly in various configurations without the need for different attaching devices for each situation and/or environment.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. patent application Ser. No.10/654,778, filed Sep. 3, 2003, entitled “Button Assembly with StatusIndicator and Programmable Backlighting,” which is acontinuation-in-part of U.S. patent application Ser. No. 10/024,129,filed Dec. 17, 2001, now U.S. Pat. No. 6,660,948, entitled “SwitchMatrix,” which claimed the benefit of U.S. Provisional Application No.60/272,020, filed Feb. 28, 2001, all of which are incorporated herein byreference in their entireties, including but not limited to thoseportions that specifically appear hereinafter, the incorporation byreference being made with the following exception: In the event that anyportion of the above-referenced applications is inconsistent with thisapplication, this application supercedes said above-referencedapplications.

BACKGROUND

1. The Field of the Invention

The present invention relates generally to keypad devices, and moreparticularly, but not necessarily entirely, to a switch matrix whichallows the use of variable key positions and key sizes on the keypad andto the use of such devices.

2. Background Art

It is common practice to provide keypads consisting of one or more keysarranged for entry of data or performing functions such as activatingswitches. Keypads are used for various types of electronic devices suchas user interfaces for home automation and security systems,calculators, telephones, etc. Keypads commonly include an assembly ofvarious parts maintained in a housing.

For example, FIG. 1 shows a keypad, generally indicated at 2, known inthe art for use as a primary control point for automation systems usedin areas such as homes, businesses, boats, yachts, motor homes andbusses. The keypad 2 includes a plurality of keys 8 which can bedepressed to control systems such as lighting, security, audio visualand heating/cooling for example. The keys 8 are connected to electroniccircuitry which is contained in a housing 4. The keys 8 are fixed inplace by an attaching plate 6 so as to be non-removable from the keypad2. The attaching plate 6 has apertures 7 through which the keys 8protrude. The apertures 7 are sized and shaped to accommodate keys 8 ofa particular size and shape. Therefore, a different attaching plate 6 isrequired for each size and shape of keys 8 used for the keypad 2.Furthermore, the location of the keys 8 is confined to the locations ofthe apertures 7. Therefore, a different attaching plate 6 must be usedfor different configurations of the keys 8. Moreover, if any of the keys8 become damaged or require replacement, the entire keypad 2 must bereplaced or the attaching plate 6 must be removed. Removal of theattaching plate 6 is a difficult task which may require the services ofa professional or use of specialized equipment since the attaching plate6 is fixed to the housing 4 and is not designed to be easily removedwithout damaging the attaching plate 6 or the housing 4.

The previously available devices are thus characterized by severaldisadvantages that are addressed by the present invention. The presentinvention minimizes, and in some aspects eliminates, the above-mentionedfailures, and other problems, by utilizing the methods and structuralfeatures described herein.

In view of the foregoing state of the art, it would be an advancement inthe art to provide a switch matrix which is capable of being used withkeys of different sizes and shapes. It would be a further advancement inthe art to provide a switch matrix which allows the keys to be arrangedin different configurations using differing numbers of keys. It wouldalso be an advancement in the art to provide a switch matrix whichallows the keys to be easily installed and replaced without damaging thematrix.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the inventionwill become apparent from a consideration of the subsequent detaileddescription presented in connection with the accompanying drawings inwhich:

FIG. 1 is a front view of a previously available keypad for anautomation system.

FIG. 2 is a side view of the keypad of FIG. 1.

FIG. 3 is an exploded perspective view of a keypad showing the switchmatrix pursuant to one illustrative embodiment of the present invention.

FIG. 4 is a plan view of an illustrative embodiment of the switch matrixof the present invention.

FIG. 5 is a side view of the switch matrix of FIG. 4.

FIG. 6 is an end view of the switch matrix of FIG. 4.

FIG. 7 is a bottom perspective view of an exemplary embodiment of a keyused in conjunction with the switch matrix of the present invention.

FIG. 8 is a top perspective view of the exemplary embodiment of the keyof FIG. 7.

FIG. 9 is a plan view of an exemplary embodiment of one of many keyconfigurations made possible by the switch matrix of the presentinvention.

FIG. 10 is an exploded perspective view of an alternative illustrativeembodiment of the switch matrix in a different keypad environment.

FIG. 11 is a break-away perspective bottom view of a cantilever systemof the switch matrix of FIGS. 3-6.

FIG. 12 is an exploded perspective view of a keypad showing theconfigurable switch matrix assembly pursuant to another illustrativeembodiment of the present invention.

FIG. 12A is an exploded perspective view of a keypad, different insignificant ways from the keypad shown in FIG. 12, showing yet anotherconfigurable switch matrix assembly pursuant to the present invention.

FIG. 13 is a top view of an exemplary lens pursuant to one illustrativeembodiment of the present invention.

FIG. 14 is a side view of the exemplary lens shown in FIG. 13.

FIG. 15 is a bottom view of the exemplary lens shown in FIGS. 13 and 14.

FIG. 16 is a perspective view of an exemplary base configured pursuantto one illustrative embodiment of the present invention.

FIG. 17 is a bottom view of the exemplary base shown in FIG. 16.

FIG. 18A is a partially exploded perspective view of an exemplary buttonassembly pursuant to another illustrative embodiment of the presentinvention.

FIG. 18B is a unexploded perspective view of the exemplary buttonassembly shown in FIG. 18A.

FIG. 19 is a perspective view of one illustrative embodiment of aconfigurable switch matrix assembly in accordance with the presentinvention.

FIG. 20 is a perspective view of one illustrative embodiment of a frameconfigured in accordance one aspect of the present invention.

FIG. 20A is a breakaway view of a portion of the frame shown in FIG. 20.

FIG. 21 is a side view of one illustrative embodiment of a cross memberin accordance with the present invention.

FIG. 22 is a top view of the cross member shown in FIG. 21.

FIG. 23 is a cross-sectional breakaway view of the cross member andframe, shown in FIGS. 20, 21 and 22, coupled together.

FIG. 24 is another cross-sectional breakaway view of the cross memberand frame, shown in FIGS. 20, 21 and 22, coupled together.

FIG. 25A is a perspective view an exemplary four panel baffle inaccordance with the present invention.

FIG. 25B is a perspective view an exemplary three panel baffle inaccordance with the present invention.

FIG. 26 is a cross-sectional view of an exemplary button assembly andconfigurable switch matrix assembly coupled together in accordance withthe present invention.

FIG. 27 is another cross-sectional view of an exemplary button assemblyand configurable switch matrix assembly coupled together in accordancewith the present invention.

FIGS. 28A-C show the various illustrative configurations of theconfigurable switch matrix assembly of the present invention.

DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS

For the purposes of promoting an understanding of the principles inaccordance with the invention, reference will now be made to theembodiments illustrated in the drawings and specific language will beused to describe the same. It will nevertheless be understood that nolimitation of the scope of the invention is thereby intended. Anyalterations and further modifications of the inventive featuresillustrated herein, and any additional applications of the principles ofthe invention as illustrated herein, which would normally occur to oneskilled in the relevant art and having possession of this disclosure,are to be considered within the scope of the invention claimed.

Referring now to FIG. 3, an exploded perspective view of a keypad,generally indicated at 10, is shown including an embodiment of a switchmatrix 20 of the present invention. The keypad 10 may be used as a userinterface for home automation and security systems, for example. Thekeypad 10 may include a plurality of keys 12 which can be depressed tocontrol systems such as lighting, security, audio visual andheating/cooling for example. However, it will be appreciated by thoseskilled in the art that the keypad 10 may be used in other environmentswithin the scope of the present invention. Other such environmentsinclude calculators, telephones, and office equipment, for example.

A housing assembly 14 for the keypad 10 may be configured in variousforms. The housing assembly 14 is shown in FIG. 3, as a combination of afront plate 14 a, a back plate 14 b and a back box 14 c, which can bejoined together in any suitable manner well known to those skilled inthe art. The housing assembly 14 may receive electronic control devicessuch as electronic circuitry board 60 containing switches 62 which canbe activated to perform a particular function. Any number of differenttypes of electronic circuitry boards 60 can be utilized within the scopeof the present invention and such electronic circuitry boards 60 canreadily be arrived at by those skilled in the pertinent art. Switches 62may be of any variety known in the art which are activated by amechanical action such as a pressing force. For example, switches 62 mayinclude resilient members which are deflected by a force to close acircuit, and upon release of the force, the resilient members rebound toopen the circuit. The electronic circuitry board 60 may be attached tothe housing assembly 14 in any suitable manner known in the art such assoldering, adhesives or fasteners, for example. The switch matrix 20 maybe attached to the housing assembly 14, as described more fully below,such that keys 12 may be attached to the switch matrix 20 to correspondto the location of the switches 62. A face plate 70 may cover the switchmatrix 20 to improve the appearance of the keypad 10 and to providefurther protection of the contents of the housing assembly 14. The faceplate 70 may be attached to the housing assembly 14 in any manner knownin the art such as magnets or fasteners, for example.

Referring now to FIG. 4, a plan view of an embodiment of the switchmatrix 20 is shown. The switch matrix 20 may include a support frame 22.The support frame 22, may include at least one longitudinal member 24and at least one lateral member 26 which, in the illustrated embodiment,are substantially perpendicular to each other. More preferably, thesupport frame 22 includes two longitudinal members 24 and a plurality oflateral members 26 arranged to support a grid of key positioning members28. The key positioning members 28 may include a first cantilever 30having an attached end 32, shown most clearly in FIG. 11. The attachedend 32 of the first cantilever 30 may be attached to a free end 38 of asecond cantilever 34. The second cantilever 34 may be disposed on thesupport frame 22 at a fixed end 36 and includes a pair of spaced apartarms 40 such that the first cantilever 30 may reside between the arms 40and parallel to the arms 40. The configuration of the first cantilever30 and the second cantilever 34 allows for improved deflection and forcetransfer capabilities in that the key positioning member 28 allows fordeflection in a substantially linear direction. For example, the firstcantilever 30 may deflect in a curved path 31 with respect to theattached end 32. Whereas the second cantilever 34 deflects in aoppositely curved path 33 with respect to the fixed end 36 of the secondcantilever 34. The opposite curvature of curved path 31 of the firstcantilever 30 and the curved path 33 of the second cantilever 34, tendto reduce the amount of curvature in travel path of the key positioningmember 28 such that deflection of the key positioning member 28 takesplace in a substantially linear direction.

A switch activating protrusion 42, shown in FIGS. 6 and 11, may bedisposed on a bottom side of the first cantilever 30. The switchactivating protrusion 42 is configured to contact the switch 62 (seeFIG. 3) as the first cantilever 30 is depressed. The upper side of thefirst cantilever 30 may include a knob 44 which may be inserted into anopening 46 defined by a sidewall 47 of the key 12, as shown in FIG. 7.The knob 44 and opening 46 are may be sized to create a compression orfriction fit between the key 12 and the knob 44 such that the key 12 isheld tightly in place. However, the key 12 is not permanently fixed tothe knob 44 such that the key 12 may be removed from the knob 44 ifdesired. The knob 44 is one example of a key attaching means. Othermeans for removably attaching a key 12 to the switch matrix 20 may beused within the scope of the present invention. For example, the knob 44may be located on the key 12 and the opening 46 may be located on theswitch matrix 20.

It will be appreciated that the structure and apparatus disclosed hereinis merely one example of a key attaching means for removably attaching akey to the switch matrix, and it should be appreciated that anystructure, apparatus or system for removably attaching a key to theswitch matrix which performs functions the same as, or equivalent to,those disclosed herein are intended to fall within the scope of a meansfor removably attaching a key to the switch matrix, including thosestructures, apparatus or systems for removably attaching a key to theswitch matrix which are presently known, or which may become availablein the future. Any structure which functions the same as, orequivalently to, the herein described means for removably attaching akey to the switch matrix falls within the scope of this element as setforth in the claims.

The knob 44 (FIG. 6) may have a diamond shape, for example, whichcorresponds to the opening 46 also having a diamond shaped and providedin the key 12. As those skilled in the art will appreciate, knobs 44 andopenings 46 of other shapes, and other structures to removably attachthe key 12 to the switch matrix 20, may be used within the scope of thepresent invention. Furthermore, the size and shape of the key 12 is notdependant upon the means for removably attaching the key 12 to theswitch matrix 20. In the prior art system shown in FIG. 1, the apertures7 of the attaching plate have a size and shape configured for specifickeys, whereas the switch matrix 20 of the present inventionadvantageously allows keys 12 of various sizes and shapes to beattached. Those skilled in the art will appreciate that advantages whichthe present invention provides by allowing different number of keys anddifferent sizes and shapes of keys to be utilized.

The switch matrix 20 may also include abutments 43 on opposing sides ofthe support frame 22, as shown most clearly in FIGS. 4-6. The abutments43 may project from the switch matrix 20 to contact the face plate 70 toprevent the face plate 70 from flexing into the knobs 44. The abutments43 may therefore prevent activation of the switches 62 due to forcesapplied to the face plate 70.

FIGS. 7 and 8 show an exemplary embodiment of the key 12. Many differentvariations of key 12 may be formed utilizing various sizes and shapes inaddition to those shown in the figures. For example, the keys 12 may beround, triangular, oval, polygonal, or in the shape of objects such asarrows, waves or light bulbs or any other shape. Preferably, keys 12include a key body 48 and a light pipe 50. The key body 48 provides asurface area which can be depressed by a human user to activate theswitch 62 (see FIG. 3). The key body 48 may also be engraved or labeledto provide an indication of the function of the key 12. The key 12 mayfurther include one or more stops 49 to prevent the key 12 from passingthrough the faceplate 70. The stops 49 may be segmented or continuousaround a bottom edge 51 of the key 12.

The light pipe 50 may be made of a translucent material which directslight from a light source 63 (see FIG. 3) located below the key 12 tothe upper surface 56 of the key 12. Thus the light pipe 50 allows thetransmission of light from the electronic circuitry board 60 to theupper surface 56 of the key 12 to provide visual signals to the user.The light pipe 50 may be attached to the key body 48 without the use ofadhesive or tools. For example, the light pipe 50 may have a projection(not shown) which may be inserted into a cavity (not shown) in the keybody 48 such that the light pipe 50 is held to the key body 48 throughfriction. The key body 48 may be configured with cut-out portions, suchas depicted at 53 in FIG. 7, to reduce the amount of material requiredto manufacture the key body 48 where possible.

The light source 63 may be located on the electronic circuitry board 60in close proximity to the switches 62 as shown in FIG. 3. The lightsource 63 may include one or more light emitting diodes, for example.The light source 63, in accordance with the principles discussedelsewhere herein, may utilize a single color or multiple colors, and maybe programmed to blink, change colors, or vary in illumination intensityto indicate the status of the keypad 10. It will be appreciated thatother devices for generating light may be used within the scope of thepresent invention.

The switch matrix 20 also may include aligning posts 58, as shown inFIGS. 5 and 6, which extend from an undersurface of the switch matrix 20to register with recesses 65 on the electronic circuitry board 60 (FIG.3). The aligning posts 58 align the switch matrix 20 so that the switchactivating protrusions 42 register properly with the switches 62. Itwill be appreciated that other structures may be used within the scopeof the present invention to align the switch matrix 20 with theelectronic circuitry board 60.

The switch matrix 20 also may include grooves 64 disposed in the supportframe 22. The grooves 64 may be configured to receive tabs 15 (see FIG.3)located on the housing assembly 14 to hold the switch matrix 20 inplace with respect to the housing assembly 14. It will be appreciated bythose skilled in the art that other structures besides the grooves 64and the tabs 15 may be used within the scope of the present invention tohold the switch matrix 20 in place with respect to the housing assembly14.

The switch matrix 20 may be formed as a single piece from moldedplastic. However, as those skilled in the art will appreciate, othermaterials may be used to form the switch matrix 20 within the scope ofthe present invention.

In use, keys 12 are attached to any or all of the key positioningmembers 28 to correspond with the position of the switches 62 on theelectronic circuitry board 60. An exemplary configuration of the keys 12on the switch matrix 20 is shown in FIG. 9. It will be appreciated thatnumerous different configurations of keys 12 are possible in addition tothat shown in FIG. 9. A key 12 may be so large as to cover multiple keypositioning members 28, or small enough such that a key 12 may beattached to all key positioning members 28. Furthermore, the switchmatrix 20 may be constructed to contain any different number of keypositioning members 28 such that the number of possible keyconfigurations is very large. The keys 12 may be attached to the switchmatrix 20 in a desired configuration without the need for makingmodifications to the switch matrix 20. Therefore, the switch matrix 20can be more easily installed at a location in the field where the switchmatrix 20 is being installed since the need for specialized tools orequipment, as required by the prior art, is eliminated. Furthermore, theswitch matrix 20 is adapted for numerous different key configurations soa single switch matrix 20 can be used in the place of multiple attachingplates 6 as required by the prior art for different key configurations.

If the need arises to repair or replace a key 12, the key 12 may simplybe detached from the switch matrix 20 by pulling on the key 12 withsufficient force to overcome the compression fit between the knob 44 andthe opening 46. This can be done without removing the switch matrix 20from the housing assembly 14, and without damaging the switch matrix 20.The ease with which the keys 12 may be replaced allows users to maintainand repair the keys 12 without the need for purchasing a new keypad 10,obtaining specialized tools or hiring a technician to perform the work.

Reference will now be made to FIG. 10 to describe a second illustrativeembodiment of the present invention. As previously discussed, theembodiments of the invention illustrated herein are merely exemplary ofthe possible embodiments of the invention, including that illustrated inFIG. 10.

It will be appreciated that the second illustrative embodiment of theinvention illustrated in FIG. 10 contains many of the same structuresrepresented in FIGS. 1-9 and only the new or different structures willbe explained to most succinctly explain the additional advantages whichcome with the illustrative embodiment of the invention illustrated inFIG. 10. The second illustrative embodiment of the inventive switchmatrix 120 is shown in a different keypad environment 110. The secondillustrative embodiment of the switch matrix 120 may include legs 166 tosupport and align the switch matrix 120 within the keypad 110. Theswitch matrix 120 also may include clips 168 to attach the switch matrix120 to other components of the keypad 110. Other components of thekeypad 110 may include a back box 114 c, a back plate 114 b, anadditional printed circuit board 116, a first insulator 117, a bracket118 and a second insulator 119. The keypad 110 may also include anoptional input unit 172. The optional input unit 172 may include a builtin infrared receiver which may allow a user to transmit commands to thekeypad 110 from a remote location. The keypad 110 may also have aservice switch lever 174 for performing functions such as cutting theflow of electricity in the keypad 110. It will be appreciated thatnumerous other configurations of components of the keypad 110 may beused within the scope of the present invention. The components of thekeypad 110 illustrated in FIG. 10 are merely exemplary of the numerousenvironments in which the switch matrix 120 may be utilized.

Referring now to FIG. 12, an exploded perspective view of anillustrative keypad, generally indicated at 200, is provided. The keypad200 may be used as a user interface for home automation and securitysystems, for example, but also have application in many differentsettings including commercial automation systems, a variety of controlsystems, and any other setting where control of an electrical device isdesired. The keypad 200 may include a plurality of button assemblies209, each individual button assembly 209 comprising a lens 210, a label212, and a base 214. Each button assembly 209 can be depressed tocontrol systems such as lighting, security, audio visual andheating/cooling, for example. However, it will be appreciated by thoseskilled in the art that the keypad 200 may be used in many otherenvironments within the scope of the present invention. Other suchenvironments include calculators, telephones, and office equipment, forexample.

The keypad 200 may also comprise a faceplate 208 and a housing assembly223 comprising a back box 224 and a back plate 226. The faceplate 208may be of varying styles, but should have an equal number of orifices tocorrespond to the number of button assemblies 209. The back box 224 andback plate 226 may assist in mounting the keypad 200.

The housing assembly 223 can be joined together in any suitable mannerwell known to those skilled in the art. The housing assembly 223 mayreceive electronic control devices such as an electronic circuitry board222. Any number of different types of electronic circuitry boards 222can be utilized within the scope of the present invention and suchelectronic circuitry boards 222 can readily be arrived at by thoseskilled in the pertinent art using the disclosure provided herein.

The illustrative electronic circuitry board 222 may comprise a pluralityof switches, one of which is shown at 228, status lights, one of whichis shown at 230, and back lights, one of which is shown at 232. Theswitches 228 may be of any variety known in the art which are activatedby a mechanical action such as a pressing force, or alternatively viaproximity. For example, switches 228 may include resilient members orplungers which are deflected by a force to close a circuit, and uponrelease of the force, the resilient members rebound or plunger to openthe circuit. The electronic circuitry board 222 may be attached to thehousing assembly 223 in any suitable manner known in the art such assoldering, adhesives or fasteners, for example.

Each button assembly 209 may have its own associated status lights 230and back lights 232. The status lights 230 and back lights 232 maycomprise one or more light sources, such as a light emitting diode(LED), as will be explained below. Further, it is not required by thepresent invention that a button assembly have associated status lights230 and back lights 232, but such structures are advantageously includedin the illustrative embodiments.

The keypad may also comprise a configurable switch matrix assembly 215on which the button assemblies 209 may be removably attached. Asdescribed herein, the configurable switch matrix assembly 215 may beconfigured for a plurality of configurations, each of the configurationscomprising a different button pattern.

The configurable switch matrix assembly 215 may comprise one or morepositionable cross members 216 removably attached to a frame 220. Inaddition, the configurable switch matrix assembly 215 also comprises apositionable baffle 218. The configurable switch matrix assembly 215 maybe adapted to receive the button assemblies 209 such that thecorresponding switches 228 on the electronic circuitry board 222 are inproper alignment.

Referring now to FIG. 12A, an exploded perspective view of anotherillustrative keypad, generally indicated at 200′, is provided. Thekeypad 200′ has overall similarities to the keypad 200 represented inFIG. 12 but includes some significant differences. The keypad 200′includes a plurality of lenses, one shown at 210′, a plurality oflabels, one shown at 212′, and a plurality of bases, one shown at 214′.

The structure represented in FIG. 12A provides an back box 224′ to whichis attached a faceplate locking structure 215′ which provides a secureand aesthetically pleasing structure to holding the faceplate in place.A recess 217′ provided in the faceplate locking structure receives aclip on the faceplate (not explicitly represented in FIG. 12A) to securethe faceplate in place.

Also shown in FIG. 12A are positionable cross members 216′ which areremovably attached to a frame 220′ and a positionable baffle 218′, in amanner similar to that described in connection with the structurerepresented in FIG. 12. An electronic circuitry board 222′ is alsorepresented in FIG. 12A.

In the following discussion reference will be made to FIGS. 13 and 14.The illustrative lens 210 may comprise an extended portion 239, aviewing surface 240, a lip 241, and a bottom surface 250. The lens 210is preferably made from a transparent material, such as plastic orglass, whereby light from status lights 230 or back lights 232 (FIG. 12)may illuminate the viewing surface 240. The extended portion 239 extendsfrom the lip 241 to a predetermined height, shown by dimension 243 whichis best shown in FIG. 14. The height should be sufficient to allow theviewing surface 240 of the lens 210 to be depressed and observed by ahuman being when the faceplate 208 is in place in the assembled keypad200. The extended portion 239 may also comprise a rounded upper portion252 connecting the extended portion 239 to the viewing surface 240.

The viewing surface 240 of the lens 210 may be divided into two or moreregions best seen in FIG. 13. A status region 246 is generally shown bythe area enclosed by the dotted lines and marked with reference 246A.The remaining area on the viewing surface 240 represents the labelregion 248. The status region 246 is the general area on the lensviewing surface 240 where a light from the status lights 230 may beobserved. The label region 248 is the general area on the viewingsurface 240 where the illumination from the back lights 232 may beobserved. The portion of lens viewing surface 240 over the status region246 may be frosted to increase visibility of the radiation emitted fromthe status light 230 (FIG. 12).

It will be appreciated that it may be desirable to illuminate the statusregion 246 in a manner different from that of the label region 248,including differing attributes of light intensity, diffusion and color.The status region 246 (FIG. 13) is illustratively formed directly overthe status lights 230 (FIG. 12). The radiation from the status lights230 may further be directly channeled to the status region 246 withoutimpediment to create a bright spot which is primarily, or entirely,confined to the status region 246. By observing the status region 246,in accordance with one illustrative embodiment of the present invention,an observer will be able to ascertain the status of the load orelectrical device controlled by depressing each of the lens 210 in thebutton assembly 209.

In addition, the lens 210 may provide magnification such that the label212 can be more easily observed. Text or symbols provided on the label212 may be enlarged with magnification for easier reading by a user.Magnification may be accomplished by adding a slight curvature to theviewing surface 240, as shown best in FIG. 14. This curvature magnifiesthe indicia provided on the label 212.

It should also be noted that the shape of the button assembly 209 can beany shape desirable, for example any number of geometric shapes. Theshape of any button assembly 209 or parts thereof described herein,however, should not be considered limiting in any way on the scope ofthe present invention.

Protruding from the lip 241 are guides 242 and tabs 244 (FIG. 13). Theguides 242 are used for alignment with the base 214 to which the lens210 is attached. The tabs 244 are used for releasably attaching the lens210 to the base 214 as will be explained below. The tabs 244 areslightly rounded as can be seen in FIG. 14 to facilitate releasablyattaching the lens 210 to the base 214.

A back view of the lens 210 represented in FIGS. 13 and 14 is providedin FIG. 15. The bottom surface 250 is substantially flat. The label 212may contact the bottom surface 250 when the button assembly 209 isassembled. The guides 242 and tabs 244 can also be seen in FIG. 15.

One illustrative embodiment of a base 214 is depicted in FIG. 16. Thebase 214 is substantially rectangular in shape having a top surface 260and a bottom surface 262. The top surface 260 comprises a recessedportion 264 of approximately the same size as the bottom surface 250 ofthe lens 210.

The recessed portion 264 may serve to receive the label 212 (FIG. 12).Around the perimeter of the recessed portion 264 is a wall 266 having aninner surface 267. Formed in the wall 266 and top surface 260 arecutouts 268. The cutouts 268 are shaped to receive the guides 242 (FIG.15) on the lip 241 of the lens 210 (FIGS. 13-14) when the lens 210 isproperly oriented with respect to the base 214 (FIG. 16).

Grooves 270 corresponding in size, number and position to the tabs 244(FIGS. 14-15) on the lens 210 are present in the inner surface 267 ofthe wall 266. The grooves 270 comprise a depression that do not extendthrough the wall 266 in the illustrative embodiment but can extendthrough the wall in alternative embodiments. A passage 271 formed in therecessed portion 264 (FIGS. 16-17) allows light from a status light 230(FIG. 12) to pass unimpeded through the base 214 to the status region246 (FIG. 13) on the viewing surface 240 of the lens 210. The passage271 extends from the bottom surface 262 of the base 214 the top surface260.

Referring now to FIG. 17, four legs 272 extend in a substantiallyoutwardly manner from the bottom surface 262 of the base 214. Connectingtwo of the legs 272 is a cross support 274 which in the illustratedembodiment may also serve as an actuator but many other structures canbe utilized in accordance within the scope of the present invention.Located on the end of each of the legs 272 is an engagement member 276.The engagement member 276 comprises a substantially perpendicularextension from the leg 272, but many other structures can also providethe same function. The four legs 272 and engagement members 276 movablycouple the button assembly 209 (FIG. 120) to the configurable switchmatrix assembly 215 or any other structure, if desired.

The base 214 (FIG. 16) may also serve to diffuse light from the backlights 232 (FIG. 12) so that it is evenly dispersed through the label212. The base 214 may be comprised of a material that diffuses the lightas it passes through the base 214, such as plastic, so that, forexample, the illumination from the back lights 232 is evenly dispersed.The base 214 may comprise a frosted portion to further diffuse thelight. It will be appreciated that the described structures preventconcentrated bright spots from appearing directly over the back lights232 when viewing the label 212 through the lens 210. It will beappreciated that the structure and apparatus disclosed herein is merelyone example of a means for diffusing light, and it should be appreciatedthat any structure, apparatus or system for diffusing light whichperforms functions the same as, or equivalent to, those disclosed hereinare intended to fall within the scope of the recited means for diffusinglight, including those structures, apparatus or systems for diffusinglight which are presently known, or which may become available in thefuture. Any structure which functions the same as, or equivalently to, ameans for diffusing light falls within the scope of such element.

FIG. 18A provides a detailed view of the label 212 (several of which areillustrated in FIG. 12) inserted into the recessed portion 264 of thebase 214 with a lens 210 oriented for assembly. An assembled buttonassembly 209 is illustrated in FIG. 18B. The guides 242 of the lens 210engage the cutouts 268 on the base 214. The label 212 is held in placebetween the bottom surface 250 of the lens 210 and the recessed portion264 of the top surface 260 of the base 214. While not explicitly shownin the figures, the button assembly 209 is held coupled by the tabs 244of the lens 210 by a snap fit into the grooves 270 of the base 214.Likewise, the button assembly 209 can be disassembled by unsnapping thetabs 244 from the grooves 270. In this manner a label 212 may be readilyreplaced when desired.

It will be appreciated that the structure and apparatus disclosed hereinis merely one example of a means for holding a label, and it should beappreciated that any structure, apparatus or system for holding a labelwhich performs functions the same as, or equivalent to, those disclosedherein are intended to fall within the scope of a means for holding alabel, including those structures, apparatus or systems for holding alabel which are presently known, or which may become available in thefuture. Any structure which functions the same as, or equivalently to, ameans for holding a label falls within the scope of this element.

It will also be appreciated that the structure and apparatus disclosedherein is merely one example of a means for releasably coupling the lensand base together, and it should be appreciated that any structure,apparatus or system for releasably coupling the lens and base togetherwhich performs functions the same as, or equivalent to, those disclosedherein are intended to fall within the scope of a means for releasablycoupling the lens and base together, including those structures,apparatus or systems for releasably coupling the lens and base togetherwhich are presently known, or which may become available in the future.Any structure which functions the same as, or equivalently to, a meansfor releasably coupling the lens and base together falls within thescope of this element.

It should also be noted that the base 214 may accept several differentstyles of lenses without modification. Each of the new styles of lenseswould only require a bottom surface capable of fitting into the recessedportion 264. The portion of the lenses visible to a human could be ofother shapes. Lenses could, for example, be round or other shapes. Afaceplate configured differently than faceplate 208 (FIG. 12) can beconfigured to accommodate lenses of other shapes.

The labels 212 (best seen in FIGS. 12 and 18A) may be created in manydifferent ways but can most advantageously be created using widelyavailable printers attached to a computer. The labels 212 may be printedin color or monochrome, as desired. The labels 212 may include text,symbols or even photographs. Moreover, the labels 212 may be a positive(opaque text with transparent background) or a negative (transparenttext with opaque back ground). The labels 212 may be fabricated from avariety of materials, including without limitation, paper, plastic,metal, fabric or any other suitable material on which the selectedprinting technique may be used. Most advantageously, the labels 212 maybe readily printed and replaced with only a minimum of instructionprovided to the user since templates are provided for use with one ofthe widely available computer programs which will facilitate printing ofthe labels 212 (including word processing and graphic computer programs)and insertion of the label 212 is accomplished by simply disassemblingthe button assembly 209. Furthermore, the labels 212 may be die-cut orsimply cut from the materials with a pair of scissors. Optionally, thetext or symbols may be painted or engraved directly on the viewingsurface 240 and/or the bottom surface 250 of the lens 210.

Referring now to FIG. 19, there is shown one illustrative embodiment ofan assembled configurable switch matrix assembly, generally indicated at215 in FIG. 19 and by bracket 215 in FIG. 12, having up to eight buttonpositions (labeled A-H) for receiving button assemblies 209. The frame220 supports a plurality of cross members 216 to form the buttonpositions (labeled A-H). In addition, a baffle 218 may optionally beused as will be further explained below.

As can be observed, each of the button positions (labeled A-H) issubstantially enclosed on four sides by the frame 220, one or more ofthe cross members 216, and baffle 218. It will be appreciated that thisenclosure formed by the aforementioned elements is sufficientlycontained to prevent substantial bleeding of radiation from the backlights 232 or status indicator lights 230 to the other button positions.This allows each button position (labeled A-H) to have its own backlights 232 and status lights 230 of varying color and intensity. Itshould be mentioned that it is not a requirement of this invention thatno radiation bleed from a button position. Some bleeding is acceptableand does not diminish the effectiveness of the present invention.

Each button position (A-H) has at least two cantilevers, some of whichare generally designated 294, disposed on opposite sides of each buttonposition, the cantilevers being shown in greater detail in FIG. 22. Anattached end 292B of each of the cantilever arms 292 may be affixed tothe frame 220 (as represented in FIG. 19) or a cross member 216 (asshown best in FIG. 19). Located on the free end 292A of each of thecantilevers arms 292 is an upwardly extending protrusion 298 having asomewhat rounded shape. As will be explained herein, the cantilevers 294provide a biasing function to provide operation of the button assembly209.

Each button position (labeled A-H in FIG. 19) further comprises a lightshroud 300. The light shroud 300 may be integrated into the frame 220 orthe light shroud 300A may be appended to the baffle 218. Eitherstructure of light shroud 300 or 300A may be used for any buttonposition (labeled A-H).

The frame 220 (FIG. 19) is substantially rectangular having an openinterior 278, a front 288, and a back 290 (as shown in FIG. 20).Referring primarily to FIG. 20, the frame 220 further comprises a topsupport 280, a bottom support 282, and a left 284 and a right 286support. Both the top support 280 and bottom support 282 comprise aplurality of cantilever arms 292 on the front 288 surface. In addition,the inner surface of both the top support 280 and the bottom support 282may comprise a plurality of engaging slots 507 and corresponding paths507A. For the top and bottom button positions A, D, E, H (see FIG. 19),the cantilever arms 292 are located on the frame 220 since it isadjacent to the named button positions.

The right support 286 (FIG. 20) comprises a plurality of cutouts 302. Asshown in the detailed view of FIG. 20A, on the interior of the frame 220and below each cutout 302 is an extrusion 324 comprising a first andsecond finger, 324C and 234D, respectively. The extrusion 324 furthercomprises a rounded upper surface 324B and an inner ledge 324A.

Referring again to FIG. 20, the left support 284 comprises a pluralityof receiving channels 304. Each channel 304 being formed by a first andsecond wall, 304A and 304B, respectively. Each receiving channel 304further comprises a bottom ledge 304C at its distal end.

The cutouts 302 (FIG. 20A) and receiving channels 304 (FIG. 20) arepositioned so that each cutout 302 is directly across from a receivingchannel 304. The cutouts 302, extrusions 324 (FIG. 20A) and receivingchannels 304 provide points of attachment for cross members 216 as willbe explained below. Cross members 216 may be positioned as desired toobtain the desired configuration of a switch matrix.

It will be appreciated that the structure and apparatus disclosed hereinis merely one example of a means for releasably supporting one or morecross members, and it should be appreciated that any structure,apparatus or system for releasably supporting one or more cross memberswhich performs functions the same as, or equivalent to, those disclosedherein are intended to fall within the scope of a means for releasablysupporting one or more cross members, including those structures,apparatus or systems for releasably supporting one or more cross memberswhich are presently known, or which may become available in the future.Any structure which functions the same as, or equivalently to, a meansfor releasably supporting one or more cross members falls within thescope of this element.

Referring now to FIGS. 21 and 22, each cross member 216 is of sufficientlength to span between the left support 284 and right support 286 of theframe 210 (see FIG. 19). Each cross member 216 has a supporting crossbrace 310 having a first end 306, a second end 308, a first side 310A, asecond side 310B, a top surface 310C and a bottom surface 310D. Thethickness between the first side 310A and the second side 310B should berelatively small in comparison with the overall length of the crossmember 216. The bottom surface 310D has a plurality of notches 309 whichallow for the various configurations of the configurable switch matrixassembly 215, and in particular, different positions for the baffle 218.Further, extending from the bottom surface 310D of the cross brace 310may be an alignment post 320. The alignment post 320 may assist inproperly aligning the configurable switch matrix assembly 215 over theelectronic circuitry board 222 during assembly.

A plurality of wings 311 may extend in a perpendicular fashion from boththe first side 310A and the second side 310B of the cross brace 310.Each wing 311 further comprises an upper surface 311A, lower surface311B and an outer surface 311C. The upper surface 311A and the lowersurface 311B being substantially perpendicular to the sides 310A and310B of the cross brace 310. The outer face 311C being substantiallyparallel to the sides 310A and 310B of the cross brace 310.

From each wing 311 may extend one or more cantilever arms 292, eachcantilever arm 292 having a protrusion 298 on its free end 292A. Thecantilever arms 292 and the first side 310A and second side 310B aresubstantially parallel to each other as can best be seen in FIG. 22. Thewings 311 may serve to offset the cantilever arms 292 from the crossbrace 310. An attached end 292B of each cantilever arm is attached to awing 311. Two cantilever arms 292 may extend from the same wing 311 inopposing directions.

The cross brace 310 should be of sufficient height, shown by thedimension 319 in FIG. 21, between the top surface 310C and the bottomsurface 310D such that the top surface 310C is in close proximity withthe faceplate 208 and that the bottom surface 310D is in close proximityto the electronic circuitry board 222 when the switch matrix assembly200 is assembled. It will be appreciated that this inhibits light frompassing from one button position (labeled A-H) to another as previouslydiscussed.

Extending from the first end 306 of the cross brace 310 may be a guidepost 312. A lower ledge 314A, back surface 314B, and an upper ledge 314Cform a holding slot 314 in the first end 306. A slanted edge 322A isdisposed between the bottom surface 310D of the cross brace 310 and thelower ledge 314A. A ledge 318 also extends perpendicularly from thesecond end 308 as well. A slanted edge 322B is disposed between thebottom surface 310D of the cross brace 310 and the ledge 318.

Each cross member 216 may be attached to the frame 220 at its first end306 and second end 308. FIG. 23 is a cross-sectional view of one mannerin which the first end 306 may be attached to the frame 220. The guidepost 312 is first positioned in the cutout 302. The holding slot 314next engages the extrusion 324 on the frame 220. In particular, therounded upper surface 324B and inner ledge 324A of the extrusion 324 areheld in place by the lower ledge 314A and upper ledge 314C of theholding slot 314. The lower ledge 314A and the slanted edge 322A of thecross member 216 are further held in place between the first finger 324Cand second finger 234D (see FIG. 20A) of the extrusion 324. It will beappreciated that this engagement arrangement provides a desirable snapfit between the holding slot 314 and the extrusion 324.

The second end 308 of the cross member 216 may also engage the frame 220with a snap fit as shown in FIG. 24. The ledge 318 on the second end 308engages the bottom ledge 304C of the receiving channel 304 (partiallyshown) on the frame 220 to thereby form the snap fit. The first wall304A and second wall 304B (not shown) of the receiving channel 304assist in holding the cross member 216 on place.

It will be appreciated that the structure and apparatus disclosed hereinis merely one example of a means for releasably attaching a crossmember, and it should be appreciated that any structure, apparatus orsystem for releasably attaching a cross member which performs functionsthe same as, or equivalent to, those disclosed herein are intended tofall within the scope of a means for releasably attaching a crossmember, including those structures, apparatus or systems for releasablyattaching a cross member which are presently known, or which may becomeavailable in the future. Any structure which functions the same as, orequivalently to, a means for releasably attaching a cross member fallswithin the scope of this element

A first illustrative embodiment of a baffle 218A is shown in FIG. 25A,while a second illustrative embodiment of a baffle 218B is shown in FIG.25B. The two different embodiments represented in FIGS. 25A-B may beused when creating different button patterns as will be addressed below.Each of the baffles, 218A and 218B, comprise a plurality of lightshrouds 300 and a plurality of panels 330.

A light shroud 300 forms a barrier so that radiation (light) from anylight emitting device positioned underneath, such as status lights 230,cannot be observed in the label region 248 on the viewing surface 240 ofthe lens 210 (see FIG. 13) during operation. Further, the light shrouds300 ensure that the majority of radiation emitted from any devicepositioned underneath is channeled primarily only to the status region246 on the viewing surface 240 of the lens 210 (see FIG. 13). Each lightshroud 300 has a hollow light channel 301 through which radiation from astatus light 230 may pass. An alternative, equivalent structure to theillustrated light shroud 300 could comprise a fiber optic structure tochannel the radiation. As discussed earlier, light shrouds 300 may alsobe incorporated into the frame 220.

It will be appreciated that the structure and apparatus disclosed hereinis merely one example of a means for channeling a light (or radiation),and it should be appreciated that any structure, apparatus or system forchanneling a light which performs functions the same as, or equivalentto, those disclosed herein are intended to fall within the scope of ameans for channeling a light, including those structures, apparatus orsystems for channeling a light which are presently known, or which maybecome available in the future. Any structure which functions the sameas, or equivalently to, a means for channeling a light falls within thescope of this element.

The panels 330 are substantially planar and reside in a substantiallyperpendicular orientation to the electronic circuitry board 222 whenassembled. The panels 330 are spaced apart on each baffle 218A and 218Bto form a plurality of slots 332. The slots 332 allow the cross members213 to extend without interference. In addition, the cross members 213may engage the sides of the slots 332 to maintain the shrouds 218A and218B in the proper position after assembly. The panels 330 also form abarrier whereby radiation from the status lights 330 and back lights 232for a particular button position cannot be observed at a different,distinct button position.

The baffle 218A further comprises a top edge 334 and a bottom edge 336.The top edge 334 and bottom edge 336 may engage one of the plurality ofgaps 305 (FIG. 20) on the top and bottom supports, 280 and 282 (FIG.20), respectively, of the frame 220 to further assist in holding thebaffle 218A in place. The gaps 505 are formed between a free end 292A ofa cantilever arm 292 and a nub 505A extruding from the frame 220 asshown in FIG. 20. It should also be noted that either baffle 218A and218B may not need to engage the frame at all and may be held in placeonly by the cross members 216. If desired, a baffle may even be absentaltogether. For example, in a case where there is no backlighting abaffle would not be needed.

As can be observed in FIG. 25A, baffle 218A has four panels 330 and fourlight shrouds 300. Baffle 218B (FIG. 25B), on the other hand, has threepanels 330 and three light shrouds 300. It will be appreciated thateither baffle (218A or 218B) may be used in the illustrative embodimentsof the present invention depending on the desired button patternpresented to the user.

It will be appreciated that the structure and apparatus disclosed hereinis merely one example of a means for baffling light, and it should beappreciated that any structure, apparatus or system for baffling lightwhich performs functions the same as, or equivalent to, those disclosedherein are intended to fall within the scope of a means for bafflinglight, including those structures, apparatus or systems for bafflinglight which are presently known, or which may become available in thefuture. Any structure which functions the same as, or equivalently to, ameans for baffling light falls within the scope of this element.

A cross-sectional view of button positions A and E from FIG. 19 is shownin FIG. 26. For purposes of discussion, some of the elements for buttonposition E have been omitted for sake of clarity when discussing thepropagation of light (radiation). As previously explained, each buttonposition may comprise a switch 228, status lights 230, and back lights232.

The status lights 230 may be located along the perimeter of the buttonposition. Over the status lights 230 is a light shroud 300. It will beappreciated that locating the status lights 230 along the perimeterensures that the light shroud 300 does not substantially interfere withthe propagation of light from the back lights 232. The light from thestatus lights 230 is directed through the light channel 301 of the lightshroud 300. The light then passes through the passage 271 on the base214 and impinges the label 212. It will be appreciated that by directingthe light in this manner, that the status region 246 (see FIG. 13) onthe lens 210 will be the primary location that is illuminated. It shouldalso be noted that the light shroud 300 may be appended to the baffle218 such as with button position E or the light shroud 300 may beintegrated into the frame 220 such as is shown with button position A.

The back lights 232 may be positioned in the middle of the buttonposition to maximize an even distribution of illumination. The backlights 232 are primarily for illuminating the label 212 when viewed inthe label region 248 (see FIG. 13). The light from the back lights 232propagates from the back lights 232 and through the base 214. The base214 may diffuse the light to thereby create a softer illumination of thelabel 212 than light shining directly on the label 212. The labels 212appear more evenly illuminated throughout the label region 248 whenviewed through the lenses 210 with diffused light rather than directlight. The light propagation is represented in button position E with aplurality of arrows.

An optional reflection layer 340 may be added on top of the electroniccircuitry board 222. The reflection layer 340 will increase lightpropagation in the desired direction. The reflection layer 340 maycomprise solder mask and silkscreen type materials, but may include anymaterial known to reflect or disburse light, as known to those involvedin the industry.

In addition to the status lights 230, back lights 232, and light shroud300, each button position may further comprise a switch 228 as can beseen in button position A. The switch 228 is positioned such that whenthe button assembly 209 is depressed that the cross support 274 actuatesa plunger on the switch 228. It will be appreciated that while a plungermechanism could be used, the use of the cross support 274 allows theswitch 228 to be placed near the perimeter of the button position tothereby not interfere with the propagation of radiation emitted from theback lights 232 to the label 212 and lens 210.

The status lights 230 and back lights 232 may comprise a single lightemitting device or a plurality of light emitting devices. In oneillustrative embodiment of the present invention, the status lights 230and back lights 232 each comprise devices which emit red light, greenlight and blue light. In another illustrative embodiment, devicesemitting red, yellow and blue light may be used. In still anotherillustrative embodiment, both the status lights 230 and back lights 232comprise two individual light emitting devices chosen from the groupcomprising devices which emit: red, green, blue and yellow light. Usingthe above combinations, virtually an unlimited number of colors can becreated, including white light, by varying the intensity of theindividual light emitting devices.

Further, each of the individual light emitting devices comprising thestatus lights 230 and back lights 232 may be under the control of amicro-processor. Thus, the colors of the status lights 230 and backlights 232 can be automatically adjusted pursuant to any presetcondition, including input from a light sensor, the time of day, or evenby manual input from a user. In addition, the status lights 230 and backlights 232 can be programmed to change color or vary in intensity toreflect changes in load or programming state. In this sense, even theback lights 232 can be used as a “status” light to relate information toan observer, including changes in the intensity and/or color perceivedby the user to convey information.

The preferred devices to function as the status lights 230 and backlights 232 are light emitting diodes (LEDs) due to their low cost, longlife, low power rating and low power consumption. Further, the use oftwo or more lights of different colors to provide varying colors oflight is not limited to back lights 232 or status lights 230. Thisaspect of the present invention can be applied in any circumstance wheresimilar radiation is used to convey information or to provide anaesthetic impression. For example, virtually any apparatus using smalllight emitting devices, such as LEDs, may utilize two or more lightemitting devices, or one device capable of emitting visible radiation inmultiple wavelengths, to provide customized colors in accordance withthe present invention.

As discussed previously, each button position may utilize twocantilevers 294 to bias each button assembly 209 toward a normal(unactuated) position. The cantilevers 294, including cantilever arms292, are composed of a resilient material having a memory. When a buttonassembly 209 is installed, the protrusions 298 on the free end 292A ofeach cantilever 292 engages the bottom surface 262 of the base 214. Thebottom surface 262 of the base 214 slightly depresses the protrusions298 on each of the cantilevers 292 when the button assembly 209 isinstalled. The resilient nature of the two cantilevers 292 provides abiasing or restoring force upwardly directed to maintain the buttonassembly 209 above the switch 228 in a normal (unactuated) position.

As discussed above, the protrusions 298 may maintain a slight upwardforce on the button assembly 209 so that the switch 228 is only actuatedwhen the button assembly 209 is actually depressed. It is not necessarythat the protrusions 298 be fixedly engaged to the button assembly 209.This structure allows the protrusions 298 to move freely when the buttonassembly 209 is depressed. When the button assembly 209 is depressed,the resilient nature of the two cantilevers 292 provides a restoringforce to return the button assembly 209 to its normal (unactuated)position when the button assembly 209 is released.

It will be appreciated that the structure and apparatus disclosed hereinis merely one example of a means for providing a restoring force, and itshould be appreciated that any structure, apparatus or system forproviding a restoring force which performs functions the same as, orequivalent to, those disclosed herein are intended to fall within thescope of a means for providing a restoring force, including thosestructures, apparatus or systems for providing a restoring force whichare presently known, or which may become available in the future. Anystructure which functions the same as, or equivalently to, a means forproviding a restoring force falls within the scope of this element.

Referring now to FIG. 27, the engagement members 276 on each of the legs272 of the base 214 removably attaches the button assembly 209 to theconfigurable switch matrix assembly 215. Each of the engagement members276 either engages the lower surface 311B of a wing 311 extending from across member 216 or engages an engaging slot 507 of the frame 220depending on the location of the button assembly 209. It will beappreciated that this may be a snap fit between the button assembly 209and the configurable switch matrix assembly 215. The engagement members276 hold the button assembly 209 in its normal position against therestoring force of the cantilevers 292. Advantageously, it will beappreciated that a faceplate 208 is not required to hold the buttonassembly 209 in position since the buttons assembly 209 will not comeapart even when the faceplate is not in place. Moreover, the structuredescribed herein provide a pivot point for the base 214 to push againstso the lens 210, acting as a button, can be pressed even on its edges.

It will be appreciated that the structure and apparatus disclosed hereinis merely one example of a means for releasably attaching a button orkey, and it should be appreciated that any structure, apparatus orsystem for means for releasably attaching a button or key which performsfunctions the same as, or equivalent to, those disclosed herein areintended to fall within the scope of a means for releasably attaching abutton or key, including those structures, apparatus or systems forreleasably attaching a button or key which are presently known, or whichmay become available in the future. Any structure which functions thesame as, or equivalently to, a means for releasably attaching a buttonor key falls within the scope of this element.

Still referring to FIG. 27, once coupled to the configurable switchmatrix assembly 215, a button assembly 209 may, upon being depressed,travel a short distance to activate a switch 228. This travel distanceis shown by the dimension marked with the reference numeral 242. Thistravel distance is also represented in FIG. 26 by the same referencenumeral 242. Once depressed, a button assembly 209 travels downwarduntil released or until the bottom surface 262 of the base 214 collideswith the front 288 of the frame 220 or the upper surface 311A of a wing311. In this manner the button assembly 209 is prevented from damagingthe switch 228 from excessive force being applied to the button assembly209. In addition, the path 507A on the frame 220 allows the engagementmember 276 to travel unimpeded next to the frame 220.

It will be appreciated that the use of the frame 220, cross members 216,and baffles 218A and 218B, advantageously provides a configurable switchmatrix assembly 215. For purposes of this application, configurableswitch matrix assembly means a switch matrix whose components may berearranged to allow different button configurations.

As can be seen in FIGS. 28A-28C, the configurable switch matrix assembly215 may be configured in a one button center (FIG. 28A), three buttoncenter (FIG. 28A), four button center (FIG. 28B), or six-button doublerow (FIG. 28C) configurations in addition to the eight button double row(FIG. 19) configuration. It will be appreciated that one illustrativeembodiment of the configurable switch matrix assembly 215 may provideseveral different button patterns by simply changing the position of thecross members 216 and baffle 218A or 218B.

As used herein, the term “button position” refers to a location on aswitch matrix assembly where a button or a key is installed. A buttonposition may be formed by the frame 220 and cross members 216, andoptionally a baffle 218A or 218B. It will be appreciated that differentarrangements of the frame 220, cross members 216, and baffles 218A or218B may created button positions in varying locations. Otherconfigurations are possible using the same principles as are describedherein and are within the scope of this invention.

In addition, in a separate embodiment, a cross member 216A (see FIG.28B) may comprise one or more integrated lenses 252 that may be used toaccept IR signals through an IR receiver 354, both of which may beconnected to the electronic circuitry board 222. This cross member 216Amay be used in any of the configurations described or suggested herein.It will be appreciated that, advantageously, the inclusion of an IRreceiver and/or light sensor does not require a reduction in the numberof buttons used on a keypad.

It should also be noted that the configurable switch matrix assembly 215is not limited to the button assemblies 209 described herein. Theconfigurable switch matrix assembly 215 may utilize keys or buttons ofunitary or one piece construction.

In view of the foregoing, it will be appreciated that the presentinvention provides a configurable switch matrix assembly which iscapable of being used with keys or buttons of different sizes andshapes. The present invention also provides a configurable switch matrixassembly which allows the buttons or keys to be arranged in differentconfigurations using differing numbers of keys or buttons. The presentinvention further provides a configurable switch matrix which allows thekeys to be easily installed and replaced without damaging the matrix.The present invention also provides a button assembly which allowslabels to be easily installed or replaced. The present invention alsoprovides back lights and status lights with customizable colors,functions and intensity.

It is to be understood that the above-described arrangements are onlyillustrative of the application of the principles of the presentinvention. Numerous modifications and alternative arrangements may bedevised by those skilled in the art without departing from the spiritand scope of the present invention and the appended claims are intendedto cover such modifications and arrangements. Thus, while the presentinvention have been shown in the drawings and fully described above withparticularity and detail in connection with what is presently deemed tobe the most practical and preferred embodiments of the invention, itwill be apparent to those of ordinary skill in the art that numerousmodifications, including, but not limited to, variations in size,materials, shape, form, function and manner of operation, assembly anduse may be made without departing from the principles and concepts setforth herein.

1-93. (canceled)
 94. A switch matrix for use in a keypad, said switchmatrix comprising: a support frame; and at least one key positioningmember disposed on said support frame, said at least one key positioningmember comprising a first cantilever and key attaching means forremovably attaching a key to said key positioning member; wherein keysof different sizes and shapes may be attached to said switch matrix. 95.The switch matrix of claim 94 further comprising a switch activatingprotrusion disposed on said first cantilever.
 96. The switch matrix ofclaim 95 wherein said switch activating protrusion is disposed on anopposite side of said first cantilever from said key attaching means.97. The switch matrix of claim 94 further comprising a second cantileverhaving a fixed end and a free end.
 98. The switch matrix of claim 97wherein said first cantilever is disposed on said free end of saidsecond cantilever.
 99. The switch matrix of claim 98 wherein a free endof said first cantilever extends in a direction toward said fixed end ofsaid second cantilever.
 100. The switch matrix of claim 97 wherein saidfirst cantilever extends parallel to said second cantilever.
 101. Theswitch matrix of claim 97 wherein said second cantilever comprises apair of arms, and wherein said first cantilever resides between the pairof arms of the second cantilever.
 102. The switch matrix of claim 94wherein said support frame comprises at least one longitudinal memberand at least one lateral member substantially perpendicular to saidlongitudinal member.
 103. The switch matrix of claim 102 wherein saidsupport frame comprises two longitudinal members and four lateralmembers.
 104. The switch matrix of claim 94 wherein said support framecomprises at least one groove for attaching said switch matrix to saidkeypad.
 105. The switch matrix of claim 94 wherein said at least one keypositioning member comprises a plurality of key positioning membersdisposed in a series of rows and columns.
 106. The switch matrix ofclaim 105 wherein said series of rows and columns comprises four rowsand three columns to include twelve key positioning members.
 107. Theswitch matrix of claim 94 wherein said key attaching member comprises aknob.
 108. The switch matrix of claim 107 wherein said knob issubstantially diamond shaped.
 109. The switch matrix of claim 94 furthercomprising at least one stud disposed thereon for aligning the switchmatrix so that the keys register with switches.
 110. The switch matrixof claim 94 further comprising at least one leg for supporting saidswitch matrix in said keypad.
 111. The switch matrix of claim 94 furthercomprising at least one resilient clip for attaching said switch matrixto other components within said keypad.
 112. A switch matrix for use ina keypad, said switch matrix comprising: a plurality of key positioningmembers, each key positioning member comprising a first cantileverhaving an attached end, and a second cantilever having a fixed end and afree end, said attached end of said first cantilever disposed on saidfree end of said second cantilever; wherein said key positioning membersare configured to receive a key such that when said key is depressed,said first cantilever in adapted to deflect to activate a switch. 113.The switch matrix of claim 112 further comprising a switch activatingprotrusion disposed on said first cantilever.
 114. The switch matrix ofclaim 112 further comprising key attaching means for removably attachingsaid key to said plurality of key positioning members.
 115. The switchmatrix of claim 112 wherein a free end of said first cantilever extendsin a direction toward said fixed end of said second cantilever.
 116. Theswitch matrix of claim 112 wherein said first cantilever extendsparallel to said second cantilever.
 117. The switch matrix of claim 112wherein said second cantilever comprises a pair of arms, and said firstcantilever resides between said pair of arms of said second cantilever.118. The switch matrix of claim 112 further comprising a support framefor supporting said plurality of key positioning members.
 119. Theswitch matrix of claim 118 wherein said support frame comprises at leastone longitudinal member and at least one lateral member substantiallyperpendicular to said longitudinal member.
 120. The switch matrix ofclaim 119 wherein said support frame comprises two longitudinal membersand four lateral members.
 121. The switch matrix of claim 118 whereinsaid support frame comprises at least one groove for attaching saidswitch matrix to said keypad.
 122. The switch matrix of claim 112wherein said plurality of key positioning members are disposed in aseries of rows and columns.
 123. The switch matrix of claim 114 whereinsaid key attaching means comprises a knob.
 124. The switch matrix ofclaim 123 wherein said knob is substantially diamond shaped.
 125. Theswitch matrix of claim 112 further comprising at least one stud disposedthereon for aligning the switch matrix so that the keys register withswitches.
 126. The switch matrix of claim 112 further comprising atleast one leg for supporting said switch matrix in said keypad.
 127. Theswitch matrix of claim 112 further comprising at least one resilientclip for attaching said switch matrix to other components within saidkeypad.
 128. A switch matrix for use in a keypad, said switch matrixcomprising: a plurality of key positioning members, each of saidplurality of key positioning members comprising a knob; and at least onekey having an opening defined by a sidewall, said opening configured toreceive said knob to removably attach said at least one key to said knobwith a friction fit; wherein said at least one key may be attached toany of said plurality of key positioning members such that aconfiguration of said at least one key on said keypad may be varied.129. The switch matrix of claim 128 wherein said at least one keyfurther comprises a light pipe to direct light from a lower surface ofsaid at least one key to an upper surface of said at least one key. 130.The switch matrix of claim 129 wherein said light pipe is attached tosaid key by interfitting parts such that no adhesive or fasteners arerequired.
 131. The switch matrix of claim 128 wherein said plurality ofkey positioning members each comprise a first cantilever adapted todeflect to contact a switch.
 132. The switch matrix of claim 131 whereinsaid first cantilever comprises an attached end, said attached end ofsaid first cantilever being attached to a free end of a secondcantilever.
 133. The switch matrix of claim 132 wherein said secondcantilever comprises a pair of arms, and said first cantilever residesbetween said pair of arms of said second cantilever.
 134. The switchmatrix of claim 128 further comprising a support frame for supportingsaid plurality of key positioning members.
 135. The switch matrix ofclaim 134 wherein said support frame comprises at least one longitudinalmember and at least one lateral member substantially perpendicular tosaid longitudinal member.
 136. The switch matrix of claim 134 whereinsaid support frame comprises at least one groove for receiving a tab toattach said switch matrix to said keypad.
 137. The switch matrix ofclaim 128 wherein said plurality of key positioning members are disposedin a series of rows and columns.
 138. The switch matrix of claim 128wherein said knob is substantially diamond shaped.
 139. A method ofattaching one or more keys to a keypad comprising the steps of: (a)providing a switch matrix having a plurality locations where said one ormore keys may be attached; (b) attaching said switch matrix to saidkeypad; (c) providing said one or more keys of a first size and shape;(d) selecting one or more of said plurality of locations on said switchmatrix to attach said one or more keys; and (e) pressing said one ormore keys on said one or more of said selected plurality of locations toattach said one or more keys to said keypad.
 140. The method of claim139 further comprising covering said switch matrix with a face plate.141. The method of claim 139 wherein step (e) further comprises joininga knob on said one or more of said selected plurality of locations withan opening on said one or more keys to fasten said one or more keys tosaid keypad with a friction fit.
 142. The method of claim 139 furthercomprising removing said one or more keys from said keypad by pulling onsaid one or more keys.
 143. The method of claim 142 further comprisingproviding one or more keys of a second size and shape different fromsaid first size and shape, and pressing said one or more keys of saidsecond size and shape on said one or more of said selected plurality oflocations to attach said one or more keys of said second size and shapeto said keypad.
 144. The method of claim 142 further comprisingselecting another one or more of said plurality of locations andpressing said one or more keys on said another one or more of saidplurality of locations to attach said one or more keys to said keypad.145. A method for attaching keys of different sizes and shapes to akeypad, said method comprising: (a) providing a switch matrix having aplurality of attaching means for removably attaching said keys; (b)providing said keys having corresponding attaching means independent ofthe size and shape of said keys; (c) selecting a configuration of saidkeys to be attached on said keypad; (d) selecting said attaching meanscorresponding to the configuration of said keys to be attached on saidkeypad; and (e) joining said corresponding attaching means to saidselected attaching means to thereby attach said keys to said keypad.146. A switch matrix for use in a keypad, said switch matrix comprising:a grid of key attaching means for removably attaching keys of differentsizes to said switch matrix; wherein said keys may be selectivelyattached to said key attaching means to form different keyconfigurations.